Hardly doing this 4-minute exercise, after only 2 weeks, you will have slim arms

A Japanese YouTuber shared the homework to help slim and tighten arms within 2 weeks.
Momo is a famous Japanese bodybuilder Youtuber. She posted simple practice videos. Thanks to the hard work, Momo has reduced from 55kg to 44kg. One of her most popular videos is an arm exercise that slimmer and firmer in just 2 weeks.

1. Rotate the arm Imagine you are drawing circles with your arms. Repeat this for 30 seconds. 2. Turn arm in opposite direction Similar to the first step, but move to the other direction. Repeat this for 30 seconds. 3. Bend elbow behind back Bend the elbow on the back at a 90 degree angle and move it up and down. Repeat this for 30 seconds. 4. Clap your hands Hold the posture first and then clap your hands. Repeat this for 30 seconds. 5. Angel wings Straighten your arms and move the wings up and down slowly as if you have angel wings. Repeat this for 30 seconds. 6. Aerial punch Hold your arms and raise your arms above your head. Lower your arms back and raise them to the original position to “punch” the air. Repeat this for 30 seconds. 7. Bang your hands Raise your arms above your head, straighten your arms. Then bend the elbow at a 90 degree angle and lower the arm. Repeat for 30 seconds. 8. Arched motion Extend your arms and move them back and forth in a domed motion like you are drawing a rainbow. Repeat this for 30 seconds.